Question

In a first order reaction the amount of reactant decayed in three half lives (let a be is initial amount) would be:
A 7a/8
B a/8
C a/6
D 5a/6
Please Explain In Detail

Answer 1

Answer:

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Answer 2

Answer:

The amount of reactant left after n half lives for a 1st order reaction is ( 1/2)n

times the Initial concentration.

Here n =3 . So Amount of Reactant left is a/8

So Amount of reactant decayed is 7a/8

so the answer is 7a/8